摘要：留言板搭建環(huán)境創(chuàng)建文件安裝使用命令創(chuàng)建目錄進(jìn)入目錄運(yùn)行它會(huì)自動(dòng)跳轉(zhuǎn)到頁(yè)面安裝修改項(xiàng)目刪除不需要的項(xiàng)目修改完以后的項(xiàng)目目錄編寫程序因?yàn)槲覀冞@里會(huì)用到，所以我們需要先下載一個(gè)樣式庫(kù)下載樣式庫(kù)官網(wǎng)網(wǎng)址直接在瀏覽器打

create-react-app留言板

創(chuàng)建package.json文件

npm init -y

安裝create-react-app

npm install -g create-react-app

使用命令創(chuàng)建myapp目錄

create-react-app myapp

進(jìn)入myapp目錄

cd myapp  

運(yùn)行

npm start

它會(huì)自動(dòng)跳轉(zhuǎn)到頁(yè)面：

安裝loder

npm install sass-loader node-sass --save-dev

刪除不需要的項(xiàng)目

修改完以后的項(xiàng)目目錄

因?yàn)槲覀冞@里會(huì)用到Bootstarp，所以我們需要先下載一個(gè)樣式庫(kù)；

下載Bootstarp樣式庫(kù)

官網(wǎng)網(wǎng)址：
http://v3.bootcss.com/getting-started/#download
直接在瀏覽器打開就可以，打開以后會(huì)出現(xiàn)以下頁(yè)面，點(diǎn)擊第一個(gè)，下載Bootstrap就可以；

創(chuàng)建index.js文件

import React from "react";
import ReactDOM from "react-dom";
import LiuYanapp from "./LiuYanapp";

import "./bootstrap/css/bootstrap.min.css";  //引入樣式文件
ReactDOM.render(,document.getElementById("app"));      //輸出到頁(yè)面

創(chuàng)建LiuYanapp.js文件

import React from "react";

import LiuYanList from "./LiuYanList";
import LiuYanForm from "./LiuYanForm";

class LiuYanapp extends React.Component{
    constructor(props){
        super(props);
        this.ids=1;
        this.state={
                todos:[]
        };
        
        this.addItem=this.addItem.bind(this);
        this.deleteItem=this.deleteItem.bind(this);
    }
    deleteItem(id){
        let newtodos=this.state.todos.filter((item)=>{
            return !(item.id==id)
        });
          this.setState({
            todos:newtodos
        });

    }

    addItem(value){
       this.state.todos.unshift(
            {
                id:this.ids++,
                text:value,
                time:(new Date()).toLocaleString(),
                done:0
            }
       )
        this.setState({
            todos:this.state.todos
        });   
    }

    render(){
        return (
            

                

                

                

                

                

                    

                         
                            

                              
                    
                    
           
                    
                             
留言板
                             
                              
                    
                
 
            
         
        );
    }
}

export default LiuYanapp;

創(chuàng)建LiuYanForm.js文件

import React from "react";

class LiuYanForm extends React.Component{
   tijiao(event){
        event.preventDefault();
    }
    add(event){        
        if(event.type=="keyup"&&event.keyCode!=13){
            return false;
        }
        let txt=this.refs.txt.value;
        if(txt=="") return false;       
        this.props.addItem(txt);
        this.refs.txt.value="";
    }
    render(){
        return(
             

                

                    

                        
                    
                    

                      留言
                    
               
                
           
            
        );
    }
}
export default LiuYanForm;

創(chuàng)建LiuYanItem.js文件

import React from "react";

class LiuYanItem extends React.Component{
    delete(){
        this.props.deleteItem(this.props.data.id);
    }
    render(){

        let {text,time,done,id}=this.props.data;

        return (
           
               {text}
                   

                   

               {time}
               
               
                   刪除留言
                
           
        );
    }
}

export default LiuYanItem;

創(chuàng)建LiuYanList.js文件

import React from "react";

import LiuYanItem from "./LiuYanItem";
class LiuYanList extends React.Component{
    render(){
        let todos=this.props.data;
       
        let todoItems=todos.map(item=>{
            return 
        });
        
        return (
            
                    {todoItems}
                

                

                    

                        
留言
                       
                    
                
                
              
            
        );
    }
}

export default LiuYanList;

創(chuàng)建webpack.config.js文件

module.exports = {
  entry: "./index.js",
  output: {
    path:path.resolve(__dirname,"build"),
    publicPath:"/assets/",
    filename: "bundle.js"
  },
  module: {
      rules: [
    { test: /.js$/, exclude: /node_modules/, loader: "react-hot-loader!babel-loader" },
    { test: /.css$/, exclude: /node_modules/, loader: "style-loader!css-loader" },
    { test: /.eot(?v=d+.d+.d+)?$/, loader: "file-loader" },  //添加
    { test: /.(woff|woff2)$/, loader:"url-loader?prefix=font/&limit=5000" }, //添加
    { test: /.ttf(?v=d+.d+.d+)?$/, loader: "url-loader?limit=10000&mimetype=application/octet-stream" }, //添加
    { test: /.svg(?v=d+.d+.d+)?$/, loader: "url-loader?limit=10000&mimetype=image/svg+xml" } //添加
      ]
    } 
}    

輸入命令，運(yùn)行頁(yè)面

npm start

現(xiàn)在我們的頁(yè)面就完成了，現(xiàn)在的目錄：

接下來就讓我們看看效果吧！